12821957 has 2 divisors, whose sum is σ = 12821958. Its totient is φ = 12821956.

The previous prime is 12821953. The next prime is 12821969. The reversal of 12821957 is 75912821.

12821957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8491396 + 4330561 = 2914^2 + 2081^2 .

It is an emirp because it is prime and its reverse (75912821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12821957 - 2² = 12821953 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12821953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6410978 + 6410979.

It is an arithmetic number, because the mean of its divisors is an integer number (6410979).

Almost surely, 2^12821957 is an apocalyptic number.

It is an amenable number.

12821957 is a deficient number, since it is larger than the sum of its proper divisors (1).

12821957 is an equidigital number, since it uses as much as digits as its factorization.

12821957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 35.

The square root of 12821957 is about 3580.7760332084. The cubic root of 12821957 is about 234.0550981852.

The spelling of 12821957 in words is "twelve million, eight hundred twenty-one thousand, nine hundred fifty-seven".